Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2016.1923
Microsoft Security Bulletin MS16-100: Security Update for
Secure Boot (3179577)
10 August 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3320
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-100
- --------------------------BEGIN INCLUDED TEXT--------------------
Microsoft Security Bulletin MS16-100: Security Update for Secure Boot
(3179577)
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if an attacker installs an
affected boot manager and bypasses Windows security features.
This security update is rated Important for all supported editions of Windows
8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows
10.
Affected Software
Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1 [1]
Windows 10 [2]
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
[1] This update is only available via Windows Update.
[2] Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Catalog.
Vulnerability Information
Secure Boot Security Feature Bypass Vulnerability - CVE-2016-3320
A security feature bypass vulnerability exists when Windows Secure Boot
improperly loads a boot manager that is affected by the vulnerability. An
attacker who successfully exploited this vulnerability could disable code
integrity checks, allowing test-signed executables and drivers to be loaded
onto a target device. Furthermore, the attacker could bypass Secure Boot
Integrity Validation for BitLocker and Device Encryption security features.
To exploit the vulnerability, an attacker who has gained administrative
privileges or who has physical access to a target device could install an
affected boot manager.The security update addresses the vulnerability by
blacklisting affected boot managers.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Secure Boot Security Feature Bypass Vulnerability CVE-2016-3320 No No
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=ivbg
-----END PGP SIGNATURE-----